Metro Transit said all of its buses were on snow routes as of 8:30 p.m. Saturday; detailed route information is available here. Several Sound Transit routes also were on snow routes; see this page for more details.

Shortly before 9 p.m., the Weather Service, which had already upgraded a winter weather advisory to a winter storm warning, extended the warning for areas from Aberdeen in the west, all the way around the Sound to areas north and east of Everett, for three to six inches of snowfall. The warning area included Tacoma and was scheduled to expire at 4 a.m. Sunday.

Closer to the water, including the cities of Seattle and Everett, a winter weather advisory was in effect for one to three inches of snow.

Temperatures were in the upper 30s and low 40s around Seattle during the day on Saturday, but with dry air in place, temperatures rapidly cooled to near freezing with the arrival of precipitation. (Why? This site will explain.) The temperature at Sea-Tac at 11 p.m. was 31 degrees; at Boeing Field, it was 33 degrees.

Temperatures Sunday will warm into the low 40s with any lingering light snow showers becoming rain showers. The cold air is vanquished in full by Sunday night as the region switches to a rainy/mild pattern with highs near 50 amid rain at times during the week.